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The revision reported by getos is now a string rather
than an integer (since we use git shas now).

The behavior was changes in
https://codereview.chromium.org/502883002 but
unfortunately the NaCl SDK bot are still not part
of the CQ so it slipped through.

BUG=406993
R=binji@chromium.org

Review URL: https://codereview.chromium.org/507673003

Cr-Commit-Position: refs/heads/master@{#291926}